[Bug/Exploit] NM Faction leve abandonment

[Reika]

Platform: Windows 7 Ultimate 64bit.
ISP: Cox Cable
Type of Internet Connection: Fiber Optic
Internet Connection Speed: 31Mbps
Date & Time: Apr. 19, 2011 0900 CST
Frequency: Always
Character Name: Reika Shadowheart
Race: Miqo'te
World: Karnak
Class/Skill Rank: Gladiator R50
Physical Level: 50
Area and Coordinates: Camp Bloodshore
Party or Solo: Party, 8 members
NPC Name: None
Monster Name: None
In-Game Time: 2000

Steps:

1: Member started faction leve Wanted: Mammoth and Master.
2: Member abandoned leve before any fighting started.
3: Member re-joined the leve
4: We Killed both enemies and completed the leve
5: Member that abandoned still recieved a Allagan runestone from the chest

It is an exploit people can use to have a chance to obtain Allagen runestones each reset period, without having to re-gain faction points through regular guildleves.

Don't know if this is ok to do or not.

Edit: actually an in-game GM said it was a No-Go.